What's the difference between DN, Φ and de?

What's the difference between DN, Φ and de?

DN is the nominal diameter, not the inner diameter or the outer diameter. The design will have the description of DN and its corresponding pipe inner and outer diameter
Φ is the outer diameter of the pipe, usually followed by the thickness of the pipe
De is the outer diameter of pipe. It is mostly used for plastic pipe

Pipe size 2 "represents the diameter of DN?

2 "is DN = 65, 1 and 3 / 4 is DN = 50, 1 and 1 / 2 is DN = 40, 1" is DN = 25
2 "means 2 inches

What is the pipe diameter RP2 equal to dn
What is the pipe diameter RP2 equal to dn

RC - conical internal thread RP - cylindrical internal thread matching with conical external thread R - conical external thread
Dimension code teeth per inch pitch thread diameter
(in) N P major diameter D, D minor diameter D1, D1
1/16 28 0.907 7.723 6.561
1/8 28 0.907 9.728 8.566
1/4 19 1.337 13.157 11.445
3/8 19 1.337 16.662 14.95
1/2 14 1.814 20.955 18.631
5/8 14 1.814 22.911 20.587
3/4 14 1.814 26.441 24.117
7/8 14 1.814 30.201 27.877
1 11 2.309 33.249 30.291
1-1/8 11 2.309 37.897 34.939
1-1/4 11 2.309 41.91 38.952
1-1/2 11 2.309 47.803 44.845
1-3/4 11 2.309 53.746 50.788
2 11 2.309 59.614 56.656
2-1/4 11 2.309 65.71 62.752
2-1/2 11 2.309 75.184 72.226
2-3/4 11 2.309 81.534 78.578
3 11 2.309 87.884 84.926
3-1/2 11 2.309 100.33 97.372
4 11 2.309 113.03 110.072
5 11 2.309 138.43 135.472
6 11 2.309 163.83 160.872
Note: 1in = 25.4mm
1. For pipe threads sealed with threads, the marking and characteristic codes of various threads are specified as follows:
RC - conical internal thread
RP - cylindrical internal thread matched with conical external thread
R-tapered external thread
The standard stipulates that the thread size code should be written after the feature code. If the thread is mechanical rotation, it should be added with left rotation
The specific examples are as follows:
Taper internal thread: RC1 / 2
Left hand cylindrical internal thread: RP1 / 2-lh
Matching of cylindrical internal thread and conical external thread: RP2 / r2
2. The pipe threads of non threaded seals are marked as follows:
Grade a external thread: G1 / 2A
Internal thread: G1 / 2
Left hand grade B external thread: G1 / 2b-lh
Thread pair G1 / 2G1 / 2A

Physics Chapter 15 formula
It's the chapter of work and mechanical energy. All the formulas, including derivation, can be taught for several days by the teacher in one class. I've been puzzled by a lot of problems. In addition, he likes to listen to dundundun's lectures. He doesn't need to talk about them and then use them again. All the physics I've been learning since I read the complete interpretation. Now I'm going to work out the formulas

Chapter 15. Definition formula of work and mechanical energy work: w = FS 8, definition formula of power: P = w / T for uniform linear motion: P = Fv (F is power) 9, mechanical efficiency: η = w useful / W total for lifting object: W useful = GH (H is height) w total = FS 10, slope formula: FL = GH pulley block f